What would cause hair to be emitted only from object origin?
I just encountered this issue in blender and what I found out is than it is better to apply any modifiers, if you are using any, like the subsurface modifier. After i applied the modifiers the hairs vanished from the origin.

It is very important that you first remove the hair particle system from the object and then apply the modifiers, and then again apply the hair particle system.

I don't know for sure if this will work for you also, but better give it a try if you still have this issue.